Amplitude-preserving scalar PP and PS imaging condition for elastic reverse time migration based on a wavefield decoupling method

doi:10.1190/GEO2017-0840.1

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	Amplitude-preserving scalar PP and PS imaging condition for elastic reverse time migration based on a wavefield decoupling method
	Zhou, Xiyan 1,2,3; Chang, Xu 1,2; Wang, Yibo 1,2; Yao, Zhenxing 1,2
刊名	GEOPHYSICS
	2019-05-01
卷号	84 期号:3 页码:S113-S125
ISSN号	0016-8033
DOI	10.1190/GEO2017-0840.1
英文摘要	To eliminate crosstalk within the imaging results of elastic reverse time migration (ERTM), we can separate the coupled P- and S-waves from the forward source wavefield and the backpropagated receiver wavefield. The P- and S-wave decoupling method retains the original phase, amplitude, and physical meaning in the separated wavefields. Thus, it is a vital wavefield separation method in ERTM. However, because these decomposed wavefields are vectors, we could consider how to retrieve scalar images that reveal the real reflectivity of the subsurface. For this purpose, we derive a scalar P-wave equation from the velocity-stress relationship for PP imaging. The phase and amplitude of this scalar P-wave are consistent with the scalarized P-wave. Therefore, this scalar P-wave can be exploited to perform PP imaging directly, with the imaging result retaining the amplitude characteristics. For PS imaging, it is difficult to calculate a dynamic preserved scalar S-wave. However, we have developed a scalar PS imaging method that divides the PS image into energy and sign components according to the geometric relationship between the wavefield vibration and propagation directions. The energy is calculated through the amplitude crosscorrelation of the forward P-wave and backpropagated S-wave from the receivers. The sign is obtained from the dot product of the forward P-wave vector and the backpropagated S-wave vector. These PP and PS imaging methods are suitable for 2D and 3D isotropic media and maintain the correct amplitude information while eliminating polarity-reversal phenomena. Several numerical models are used to verify the robustness and effectiveness of our method.
资助项目	National Natural Science Foundation of China[41390455] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB10030500]
WOS关键词	HETEROGENEOUS MEDIA ; DEPTH MIGRATION ; S-WAVE ; PROPAGATION ; PRESTACK
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000468946700010
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92252]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者	Chang, Xu
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Xiyan,Chang, Xu,Wang, Yibo,et al. Amplitude-preserving scalar PP and PS imaging condition for elastic reverse time migration based on a wavefield decoupling method[J]. GEOPHYSICS,2019,84(3):S113-S125.
APA	Zhou, Xiyan,Chang, Xu,Wang, Yibo,&Yao, Zhenxing.(2019).Amplitude-preserving scalar PP and PS imaging condition for elastic reverse time migration based on a wavefield decoupling method.GEOPHYSICS,84(3),S113-S125.
MLA	Zhou, Xiyan,et al."Amplitude-preserving scalar PP and PS imaging condition for elastic reverse time migration based on a wavefield decoupling method".GEOPHYSICS 84.3(2019):S113-S125.